1106Topic 5 2011 - Chapter 10

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Chapter 10 http://en.wikibooks.org/wiki/Human_Physiology/The_Muscular_System
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5.3 Muscles of the Head – Facial Expression • insert into skin or other muscles, not bones; innervated by the facial nerve epicranius = main muscle of scalp – consists of: (i) frontalis : raises eyebrows, wrinkles forehead (ii) occipitalis: pulls scalp posteriorly orbicularis oculi: surrounds rim of orbit; protects eyes from light/injury – blinking, squinting, also draws eyebrows down zygomaticus (cheek to corner of mouth): smiling muscle orbicularis oris: lips; multi-layered; closes, purses, protrudes lips mentalis (mandible to chin) : V-shaped pair – protrudes lower lip; wrinkles chin buccinator ʘ (mandible/maxilla to orb.oris) : deep to masseter – whistling, sucking; hold food in place when chewing; especially in nursing infants platysma (fascia of chest to mandible) : helps depress mandible; tenses skin of neck Fig. 10.6
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5.4 Muscles that move the tongue genioglossus (mandible to inferior tongue & hyoid bone): prime mover of tongue protrusion; anchors tongue to prevent obstruction of respiration hyoglossus (hyoid bone to inferolateral tongue): depresses tongue, especially lateral margins styloglossus (styloid process of temporal bone to inferolateral tongue): Fig. 10.7c
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Fig. 10.7 2. Muscles of the Head: Mastication, etc 4 pairs involved in chewing; all innervated by mandibular division of cranial nerve V masseter ʘ (zygomatic to mandible) : prime mover of jaw closure (powerfully) temporalis ʘ (temporal to mandible) : elevates and retracts mandible (closes jaw); maintains closed jaw at rest medial and lateral pterygoid (sphenoid to mandible) : both two-headed; additional jaw movements (eg: side-to-side grinding movments) buccinator (mandible/maxilla to orbicularis oris) : helps keep food between grinding surfaces of teeth during chewing
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5.5 Muscles of the Neck & Vertebral Column: head moved by muscles originating from axial skeleton sternocleidomastoid (manubrium/clavicle to mastoid process of temporal) : 2- headed; deep to platysma; prime mover (both muscles) of head flexion;
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This note was uploaded on 02/08/2012 for the course ANP 1105 taught by Professor Carnegie during the Fall '08 term at University of Ottawa.

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1106Topic 5 2011 - Chapter 10

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